Congratulations Canon, you did it!! Finally this widezoom provides me the professional images I was hoping for. The 16-35 L II produces really superb images of exceptional quality, in every way: sharpness, color, contrast, everything is so great about this lens.
I sold my 17-40 L to get this lens. Yes, it is very expensive, but worth every penny. I was a little bit disappointed about the 17-40, because it wasn't really tack sharp. I even sent it to Canon to calibrate it. After that calibration it was much better, I really liked this lens, but yet I decided to go for the 16-35 II.
I use it on a 5D and the images are just outstanding, crispy clear, very sharp. Even at F2.8 this lens is amazing. The bokeh is so lovely. If you view the images on a 22" screen, be aware: sometimes you can't believe your eyes anymore This lens is just fantastic!
The only minuspoint could be the 82mm filter size. I was using an expensive B&W 77mm slim circ. pol., which became useless, so I had to buy a 82.
For those who still hesitate to buy this lens I would say: wait no longer, but run to your supplier and buy this masterpiece. You won't regret your purchase, not even for a second.